Hi so I used opencv to get webcam feed from my default camera and I wish to display it in a picturebox on my windows form. My webcam comes on but for some reason, the feed is never displayed on my picturebox. Please could someone help point out/solve the issue as I am stuck here right now. Thanks in advance.
In myform.h, I have this code to send the picturebox to the myform.cpp file:
System::Windows::Forms::PictureBox^ mypicbox1(void)
{
opencv_gui::MyForm aform;
return aform.pictureBox1;
}
and the code to draw get the videofeed and put into my picture box in myform.cpp is:
void opencv_gui::DrawCvImage(const cv::Mat& cvImage)
{
System::Windows::Forms::PictureBox^ pictureBox = mypicbox1();
// only color images are supported
assert(cvImage.type() == CV_8UC3);
if ((pictureBox->Image == nullptr) || (pictureBox->Width != cvImage.cols) || (pictureBox->Height != cvImage.rows))
{
pictureBox->Width = cvImage.cols;
pictureBox->Height = cvImage.rows;
pictureBox->Image = gcnew System::Drawing::Bitmap(cvImage.cols, cvImage.rows);
}
// Create System::Drawing::Bitmap from cv::Mat
System::Drawing::Bitmap^ bmpImage = gcnew System::Drawing::Bitmap(
cvImage.cols, cvImage.rows, cvImage.step,
System::Drawing::Imaging::PixelFormat::Format24bppRgb,
System::IntPtr(cvImage.data)
);
// Draw Bitmap over a PictureBox
System::Drawing::Graphics^ g = System::Drawing::Graphics::FromImage(pictureBox->Image);
g->DrawImage(bmpImage, 0, 0, cvImage.cols, cvImage.rows);
pictureBox->Refresh();
delete g;
}
//camera feed
int opencv_gui::video_cap(void)
{
VideoCapture cap;
if (!cap.open(0)) // open the default camera (camera 0), use something different from 0 otherwise;
return 0;
for (;;)
{
Mat frame;
cap >> frame;
if (frame.empty()) break; // end of video stream
DrawCvImage(frame);
if (waitKey(10) == 27) break; // stop capturing by pressing ESC
}
// the camera will be closed automatically upon exit
// cap.close();
return 0;
}
This is my debug log: I have used arrows like ">>>>>>>" to show important parameters and the words "RED >>>>>>>" to show error parameters.
cvImage { flags=1124024336 dims=2 rows=480 ...} cv::Mat& allocator 0x0000000000000000 cv::MatAllocator* cols 640 int
data 0x0000026AC2146F80 unsigned char* *(*cvImage).data 0 '' unsigned char
dataend 0x0000026AC2227F80 unsigned char* datalimit 0x0000026AC2227F80 unsigned char* datastart 0x0000026AC2146F80 unsigned char* dims 2 int flags 1124024336 int rows 480 int size { p=0x000000DBDFF0DE80 } cv::MatSize
p 0x000000DBDFF0DE80 int* *(*cvImage).size.p 0 int
step { p=0x000000DBDFF0DEC8 buf={Length=2} } cv::MatStep buf {Length=2} unsigned __int64[] p 0x000000DBDFF0DEC8 unsigned __int64* u 0x0000026AA4814780 cv::UMatData* RED >>>>>>> bmpImage 0x0000026aa62a1fd0 { defaultTransparentColor= } System::Drawing::Bitmap^ RED >>>>>>> System::Drawing::Image^ 0x0000026aa62a1fd0 { nativeImage=2657511292512 rawData= userData= } System::Drawing::Image^ defaultTransparentColor System::Drawing::Color g System::Drawing::Graphics^ RED >>>>>>> pictureBox 0x0000026aa62a1388 { borderStyle=System::Windows::Forms::BorderStyle::None image=0x0000026aa62a1fa0 sizeMode=System::Windows::Forms::PictureBoxSizeMode::Normal ...} System::Windows::Forms::PictureBox^ RED >>>>>>> System::Windows::Forms::Control^ 0x0000026aa62a1388 { ControlKeyboardRouting= PaletteTracing= FocusTracing= ...} System::Windows::Forms::Control^ AllowDrop false bool BorderStyle System::Windows::Forms::BorderStyle::None System::Windows::Forms::BorderStyle CausesValidation true bool CreateParams 0x0000026aa62a15d8 { className= caption= style=1442840576 ...} System::Windows::Forms::CreateParams^ DefaultImeMode System::Windows::Forms::ImeMode::Disable System::Windows::Forms::ImeMode DefaultSize {Width=100 Height=50} System::Drawing::Size EVENT_SIZEMODECHANGED 0x0000026aa629af50 System::Object^ ErrorImage 0x0000026aa629b110 { nativeImage=2657511192608 rawData= userData= } System::Drawing::Image^ Font 0x0000026aa6280148 {} System::Drawing::Font^ ForeColor {RGB=0x0} System::Drawing::Color Image 0x0000026aa62a1fa0 { nativeImage=2657511290992 rawData= userData= } System::Drawing::Image^ [System::Drawing::Bitmap^] 0x0000026aa62a1fa0 { defaultTransparentColor= } System::Drawing::Bitmap^ System::MarshalByRefObject^ 0x0000026aa62a1fa0 { __identity= } System::MarshalByRefObject^ Flags 2 int FrameDimensionsList {Length=1} array ^ Height 480 int HorizontalResolution 96.000000 float Palette 0x0000026aa62a25e8 { flags=1129621568 entries={Length=0} } System::Drawing::Imaging::ColorPalette^ PhysicalDimension { width=640.00000 height=480.00000 } System::Drawing::SizeF PixelFormat System::Drawing::Imaging::PixelFormat::Format32bppArgb System::Drawing::Imaging::PixelFormat PropertyIdList {Length=0} array ^ PropertyItems {Length=0} array ^ RawFormat 0x0000026aa62a3488 { ...} System::Drawing::Imaging::ImageFormat^ Size {Width=640 Height=480} System::Drawing::Size Tag System::Object^ VerticalResolution 96.000000 float Width 640 int nativeImage 2657511290992 __int64 rawData array ^ userData System::Object^ ImageLocation System::String^ ImageRectangle {X=0 Y=0 Width=640 Height=480} System::Drawing::Rectangle ImeMode System::Windows::Forms::ImeMode::Disable System::Windows::Forms::ImeMode InitialImage 0x0000026aa629c568 { nativeImage=2657511196256 rawData= userData= } System::Drawing::Image^ PICTUREBOXSTATE_asyncOperationInProgress 1 int PICTUREBOXSTATE_cancellationPending 2 int PICTUREBOXSTATE_inInitialization 64 int PICTUREBOXSTATE_needToLoadImageLocation 32 int PICTUREBOXSTATE_useDefaultErrorImage 8 int PICTUREBOXSTATE_useDefaultInitialImage 4 int PICTUREBOXSTATE_waitOnLoad 16 int RightToLeft System::Windows::Forms::RightToLeft::No System::Windows::Forms::RightToLeft SizeMode System::Windows::Forms::PictureBoxSizeMode::Normal System::Windows::Forms::PictureBoxSizeMode TabIndex 1 int TabStop false bool Text "" System::String^ WaitOnLoad false bool borderStyle System::Windows::Forms::BorderStyle::None System::Windows::Forms::BorderStyle contentLength 0 int currentAsyncLoadOperation System::ComponentModel::AsyncOperation^ currentlyAnimating false bool defaultErrorImage 0x0000026aa629b110 { nativeImage=2657511192608 rawData= userData= } System::Drawing::Image^ defaultErrorImageForThread 0x0000026aa629b110 { nativeImage=2657511192608 rawData= userData= } System::Drawing::Image^ defaultErrorImageKey 0x0000026aa629af08 System::Object^ defaultInitialImage 0x0000026aa629c568 { nativeImage=2657511196256 rawData= userData= } System::Drawing::Image^ defaultInitialImageForThread 0x0000026aa629c568 { nativeImage=2657511196256 rawData= userData= } System::Drawing::Image^ defaultInitialImageKey 0x0000026aa629aef0 System::Object^ errorImage 0x0000026aa629b110 { nativeImage=2657511192608 rawData= userData= } System::Drawing::Image^ handleValid false bool image 0x0000026aa62a1fa0 { nativeImage=2657511290992 rawData= userData= } System::Drawing::Image^ imageInstallationType ImageInstallationType::DirectlySpecified ImageInstallationType imageLocation System::String^ initialImage 0x0000026aa629c568 { nativeImage=2657511196256 rawData= userData= } System::Drawing::Image^ [System::Drawing::Bitmap^] 0x0000026aa629c568 { defaultTransparentColor= } System::Drawing::Bitmap^ System::MarshalByRefObject^ 0x0000026aa629c568 { __identity= } System::MarshalByRefObject^ Flags 73744 int FrameDimensionsList {Length=1} array ^ Height 16 int HorizontalResolution 96.000000 float RED >>>>>>>Palette 0x0000026aa629ea60 { flags=951278840 entries={Length=0} } System::Drawing::Imaging::ColorPalette^ PhysicalDimension { width=14.000000 height=16.000000 } System::Drawing::SizeF PixelFormat System::Drawing::Imaging::PixelFormat::Format24bppRgb System::Drawing::Imaging::PixelFormat PropertyIdList {Length=0} array ^ PropertyItems {Length=0} array ^ RED >>>>>>> RawFormat 0x0000026aa629f900 { ...} System::Drawing::Imaging::ImageFormat^ Size {Width=14 Height=16} System::Drawing::Size Tag System::Object^ VerticalResolution 96.000000 float Width 14 int nativeImage 2657511196256 __int64 rawData array ^ userData System::Object^ RED >>>>>>> internalSyncObject 0x0000026aa629d900 System::Object^ loadCompletedDelegate System::Threading::SendOrPostCallback^ loadCompletedKey 0x0000026aa629af20 System::Object^ loadProgressChangedKey 0x0000026aa629af38 System::Object^ loadProgressDelegate System::Threading::SendOrPostCallback^ localImageStreamReader System::IO::StreamReader^ pictureBoxState { data=12 } System::Collections::Specialized::BitVector32 readBlockSize 4096 int readBuffer array ^ savedSize {Width=640 Height=480} System::Drawing::Size sizeMode System::Windows::Forms::PictureBoxSizeMode::Normal System::Windows::Forms::PictureBoxSizeMode tempDownloadStream System::IO::MemoryStream^ totalBytesRead 0 int uriImageStream System::IO::Stream^
不得不编辑我的代码，但我几乎解决了我的问题，使用这里提供的答案：https://stackoverflow.com/a/12628861/5728859
尝试这个
private: System::Void button2_MouseClick(System::Object^ sender, System::Windows::Forms::MouseEventArgs^ e)
{
if (button2->Text == "Stop")
{
button2->Text = "Start";
}
else if (button2->Text == "Start")
{
button2->Text = "Stop";
}
VideoCapture capture(0);
Mat frame;
while (button2->Text == "Stop")
{
capture.read(frame);
System::Drawing::Graphics^ graphics2 = pictureBox1->CreateGraphics();
System::IntPtr ptr2(frame.ptr());
System::Drawing::Bitmap^ b2 = gcnew System::Drawing::Bitmap(frame.cols,
frame.rows, frame.step, System::Drawing::Imaging::PixelFormat::Format24bppRgb, ptr2);
System::Drawing::RectangleF rect2(0, 0, pictureBox1->Width, pictureBox1->Height);
graphics2->DrawImage(b2, rect2);
}
}
链接地址:
http://www.djcxy.com/p/35414.html
上一篇:
jQuery获得textarea文本
下一篇:
OpenCV Webcam feed在PictureBox visual studio 2015中不显示
